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Chemistry

Hemoglobin contains \( 0.34\% \) of iron by mass, The number of Fe atoms in \( 3.3 \, \text{g} \) of hemoglobin is. (Given Atomic mass of Fe is \( 56 \, \text{u} \), \( N_A = 6.022 \times 10^{23} \, \text{mol}^{-1} \))

32.

Arrange the following in increasing order of their covalent character.
A. \( \mathrm{CaF_2} \) B. \( \mathrm{CaCl_2} \) C. \( \mathrm{CaBr_2} \) D. \( \mathrm{CaI_2} \)
Choose the correct answer from the options given below:

33.

Class XII students were asked to prepare one litre of buffer solution of pH \( 8.26 \) by their Chemistry teacher. The amount of ammonium chloride to be dissolved by the student in \( 0.2 \, \text{M} \) ammonia solution to make one litre of the buffer is: (Given: \( pK_b(\mathrm{NH_3}) = 4.74 \) Molar mass of \( \mathrm{NH_3} = 17 \, \text{g mol}^{-1} \) Molar mass of \( \mathrm{NH_4Cl} = 53.5 \, \text{g mol}^{-1} \))

34.

At \( 30^\circ \text{C} \), the half life for the decomposition of \( \mathrm{AB_2} \) is \( 200 \, \text{s} \) and is independent of the initial concentration of \( \mathrm{AB_2} \). The time required for \( 80\% \) of the \( \mathrm{AB_2} \) to decompose is: (Given: \( \log 2 = 0.30 \), \( \log 3 = 0.48 \))

35.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Finest gold is red in colour, as the size of the particles increases, it appears purple then blue and finally gold.
Reason R: The colour of the colloidal solution depends on the wavelength of light scattered by the dispersed particles.
In the light of the above statements, choose the most appropriate answer from the options given below:

36.

The metal that has very low melting point and its periodic position is closer to a metalloid is:

37.

The metal that is not extracted from its sulfide ore is:

38.

The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are:

39.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : \( \mathrm{LiF} \) is sparingly soluble in water
Reason R : The ionic radius of \( \mathrm{Li^+} \) ion is smallest among its group members, hence has least hydration enthalpy.
In the light of the above statements, choose the most appropriate answer from the options given below

40.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Boric acid is a weak acid.
Reason R : Boric acid is not able to release \( \mathrm{H^+} \) ion on its own. It receives \( \mathrm{OH^-} \) ion from water and releases \( \mathrm{H^+} \) ion.
In the light of the above statements, choose the most appropriate answer from the options given below

41.

The metal complex that is diamagnetic is (Atomic number: Fe, \( 26 \); Cu, \( 29 \))

42.

Match List I with List II

List-I Pollutant	List II Source
A. Microorganisms	I. Strip mining
B. Plant nutrients	II. Domestic sewage
C. Toxic heavy metals	III. Chemical fertilizer
D. Sediment	IV. Chemical factory

Choose the correct answer from the options given below:

43.

The correct decreasing order of priority of functional groups in naming an organic compound as per IUPAC system of nomenclature is:

44.

Which of the following is not an example of benzenoid compound?

45.

Hydrolysis of which compound will give carbolic acid?

46.

Consider the above reaction and predict the major product:

47.

The correct sequential order of the reagents for the given reaction is

48.

Vulcanization of rubber is carried out by heating a mixture of

49.

Animal starch is the other name of

50.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Phenolphthalein is a pH dependent indicator, remains colourless in acidic solution and gives pink colour in basic medium.
Reason R: Phenolphthalein is a weak acid. It doesn't dissociate in basic medium.
In the light of the above statements, choose the most appropriate answer from the options given below

51.

A \( 10 \, \text{g} \) mixture of hydrogen and helium is contained in a vessel of capacity \( 0.0125 \, \text{m}^3 \) at \( 6 \, \text{bar} \) and \( 27^\circ \text{C} \). The mass of helium in the mixture is ______ g. (nearest integer) Given : \( R = 8.3 \, \text{J K}^{-1} \text{mol}^{-1} \) (Atomic masses of H and He are \( 1u \) and \( 4u \), respectively)

52.

Consider an imaginary ion \( ^{48}_{22}X^{3-} \). The nucleus contains '\( a \)'% more neutrons than the number of electrons in the ion. The value of 'a' is ______ (nearest integer)

53.

For the reaction \( \mathrm{H_2F_2(g) \rightarrow H_2(g) + F_2(g)} \)
\( \Delta U = -59.6 \, \text{kJ mol}^{-1} \) at \( 27^\circ \text{C} \).
The enthalpy change for the above reaction is (−) ______ \( \text{kJ mol}^{-1} \) (nearest integer)
Given : \( R = 8.314 \, \text{J K}^{-1} \text{mol}^{-1} \)

54.

The elevation in boiling point for \( 1 \) molal solution of non-volatile solute A is \( 3 \, \text{K} \). The depression in freezing point for \( 2 \) molal solution of A in the same solvent is \( 6 \, \text{K} \). The ratio of \( K_b \) and \( K_f \) i.e., \( {K_b}/{K_f} \) is \( 1 : X \). The value of \( X \) is [nearest integer]

55.

\( 20 \, \text{mL} \) of \( 0.02 \, \text{M} \) hypo solution is used for the titration of \( 10 \, \text{mL} \) of copper sulphate solution, in the presence of excess of \( \mathrm{KI} \) using starch as an indicator. The molarity of \( \mathrm{Cu^{2+}} \) is found to be be _______ \( \times 10^{-2} \, \text{M} \). (nearest integer)
Given : \( 2\mathrm{Cu^{2+}} + 4\mathrm{I^-} \rightarrow \mathrm{Cu_2I_2} + \mathrm{I_2} \)
\( \mathrm{I_2} + 2\mathrm{S_2O_3^{2-}} \rightarrow 2\mathrm{I^-} + \mathrm{S_2O_6^{2-}} \)

56.

The number of non-ionizable protons present in the product \( B \) obtained from the following reactions is ______.
\( \mathrm{C_2H_5OH} + \mathrm{PCl_3} \rightarrow \mathrm{C_2H_5Cl} + A \)
\( A + \mathrm{PCl_3} \rightarrow B \)

57.

The spin-only magnetic moment value of the compound with strongest oxidizing ability among \( \mathrm{MnF_4} \), \( \mathrm{MnF_3} \) and \( \mathrm{MnF_2} \) is ________ B.M. (nearest integer)

58.

Total number of isomers (including stereoisomers) obtained on monochlorination of methylcyclohexane is _______.

59.

A \( 100 \, \text{mL} \) solution of \( \mathrm{CH_3CH_2MgBr} \) on treatment with methanol produces \( 2.24 \, \text{mL} \) of a gas at STP. The weight of gas produced is ________ \( \text{mg} \). [nearest integer]

60.

How many of the following drugs is/are example(s) of broad spectrum antibiotics?
Ofloxacin, Penicillin G, Terpineol, Salvarsan.

JEE Main 2022 26th July Evening Shift

Physics Chemistry Mathematics

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